Material Specifications: Proprietary three-layer configuration incorporates two different microporous layers. Specially treated base fabric for durable water repellency Layer 1 - "Foam" layer with minuscule micropores improves waterproofness, and durability Layer 2 - Regularly configure micropores increase moisture permeability Layer 3 - Smaller pores in the resin surface enhance waterproofness, strengthen coating surface and inhibit dew condensation. **************************************************** Test Data: Water vapour permeability - it is test that how much grams per m2 can be radiation of the sweat from inside to outside when weared a hyvet . it test for 24 hours . the hyvet fabric tested 11998g/m2/24h for camo hyvet & 11871g/m2/24h for black hyvet . Water resistance - it is test that how much waters can be soak from outside to inside when it is raining . so it test by 600mmH2 O/min the hyvet fabric tested over 10000mm for camo & black ( generally, it is acceptable 600mm for water resistance )